A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Francis Upchurch
Date: 2017 Jan 9, 03:28 -0800
Update, correction on lunar clearnce.
Using conventional corrections (not the special AH ones), and your observed readings I now get LDo 36°57.4' with the Karl Cosine and LDo 36°58.3' with the Thompson compared to Frank's 36°57.5'.
So I think the anomally relates mostly to my use of the AH modified corrections.
Interestingly, the Thompson result is the same with either type of correction ,presumably because it does not require Ho and especially ho, where most of the differences in corrections occur.
I assume that Frank's site calculator does not do this, so using normal corrections I get similar results with cosine formula as Frank. (well 0.1' out)
So perhaps Frank could advise about how to deal with artifical horizons and lunar clearance?